A half gallon every three days? Bitch, that's like a full oil change every week. This isn't a leak so much as an open tube slowly pissing on the ground. I'm actually going to do the math, so hang on a tick.

Three days, 72 hours. 72 hours, 4320 minutes. 4320 minutes, 259200 seconds. Okay, now, we're just going to say a quart is equivalent to a liter so my math is 'easier,' don't judge me. 2 liters, 2000 mL. 2,000 mL, 2,000,000 microliters. So 2,000,000 microliters / 259200 seconds = 7.7 microliters/second.

That's probably a difficult amount to visualize, so to put it in perspective it is roughly equivalent to a milliliter every two minutes, a shot (of liquor, size) every hour. A hospital page I just not-googled said males average ~21 mL/sec pissing in young adulthood, declining throughout life, while women average 18 mL/sec for their adult lives. So, fine, we're not exactly at human pissing rates here, but still.